Could smoking be the cause of this, and if so, what problems might there be if I don't quit smoking?

I have a cough that doesn't go away for months, shortness of breath and phlegm. I have wheezing. Could this be due to smoking? What problems can happen if I don't quit smoking?
Give me [b]relevant[/b] answers.

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TheOrionbeltseeker · 36-40, M

The earlier you quit smoking, the better your lungs will replenish. The tar will clear out and your irritation in the lungs would be gone. Congratulations for taking the first step to think about it. Rest all would be easier.